Total of three units to UP, numbered UP 1542-1544; leased from Locomotive Lease Partners; delivered to UP in March 1997.

b.

Built as C&NW 4411, 4412, and 4413 (part of C&NW 4411-4424 group); GMAC lease to C&NW expired on 31 December 1991; all 14 units were retired by C&NW in January 1992 and returned to owner/lessor, GMAC, in March 1992; leased to California Northern Railroad (CFNR) in October 1993; lease to CFNR expired in late 1996 and these three units were leased to UP.

c.

Not equipped with dynamic braking.

d.

Assigned UPY 542-544 in December 1999 (UP 1542-1544); only UP 1542/UP 542 was renumbered.

Note:

1.

UPY 542 lease expired on 29 July 2002; returned to owner Locomotive Leasing Partners; in national lease service as LLPX 1514.

Total of 20 MP units went to UP at merger, numbered MP 1555-1574; renumbered to UP 1555-1574 in December 1985 through April 1991 (UP 1572 was the first, completed on 5 December 1985, and UP 1555 was the last, completed on 29 April 1991).

b.

Originally lettered for Chicago & Eastern Illinois (C&EI), the last units to be so lettered prior to that road's being officially merged with parent Missouri Pacific Corp., on 15 October 1976.

c.

Of the original 20 units, three units (MP 1560, 1568, 1571) were repainted to UP yellow and gray, with Missouri Pacific lettering, in June through October 1985; relettered to UP in April through July 1989.

d.

Not equipped with dynamic braking.

e.

Individual unit histories:

Road
Number

First
Number

Second
Number

Third
Number

UPY 555

C&EI 1555

MP 1555

UP 1555

UPY 556

C&EI 1556

MP 1556

UP 1556

(UPY 557)

C&EI 1557

MP 1557

UP 1557

UPY 558

C&EI 1558

MP 1558

UP 1558

UPY 559

C&EI 1559

MP 1559

UP 1559

UPY 560

C&EI 1560

MP 1560

UP 1560

UPY 561

C&EI 1561

MP 1561

UP 1561

UPY 562

C&EI 1562

MP 1562

UP 1562

UPY 563

C&EI 1563

MP 1563

UP 1563

UPY 564

C&EI 1564

MP 1564

UP 1564

UPY 565

C&EI 1565

MP 1565

UP 1565

UPY 566

C&EI 1566

MP 1566

UP 1566

UPY 567

C&EI 1567

MP 1567

UP 1567

UPY 568

C&EI 1568

MP 1568

UP 1568

UPY 569

C&EI 1569

MP 1569

UP 1569

UPY 570

C&EI 1570

MP 1570

UP 1570

UPY 571

C&EI 1571

MP 1571

UP 1571

(UPY 572)

C&EI 1572

MP 1572

UP 1572

UPY 573

C&EI 1573

MP 1573

UP 1573

UPY 574

C&EI 1574

MP 1574

UP 1574

Note:

1.

UPY 558 (ex UP 1558) was the first unit in this group to be renumbered, completed on 19 April 2000.

Total of 140 MP units went to UP at merger, numbered MP 1575-1714; renumbered to UP 1575-1714 in November 1985 through October 1993 (UP 1654 was the first, completed on 25 November 1985, and UP 1685 was the last, completed on 11 October 1993).

b.

Of the original 140 units, 26 units (MP 1576, 1577, 1580, 1588, 1590, 1595, 1596, 1600, 1619, 1620, 1621, 1628, 1642, 1644, 1645, 1650, 1651, 1655, 1689, 1690, 1693, 1694, 1702, 1706, 1708, 1712) were repainted to UP yellow and gray, with Missouri Pacific lettering, in July 1984 through November 1985; relettered to UP in May 1987 through September 1993.

c.

The UPY number 666 is blank and not used.

d.

UPY 700-714 are equipped with Automatic Train Stop (ATS) for operation along former C&NW Chicago lines, and Automatic Train Control (ATC) for operation along other former C&NW lines.

e.

Not equipped with dynamic braking.

Note:

1.

UPY 654 (ex UP 1654) was the first in this group to be renumbered, completed on 22 December 1999; it is also the first to receive the new UPY reporting mark.

Total of 30 MP units went to UP at merger, numbered MP 1715-1744; renumbered to UP 1715-1744 in December 1985 through September 1993 (UP 1730, ex MP 1730, was the first, completed on 20 December 1985, and UP 1716, ex MP 1716, was the last, completed on 20 September 1993).

b.

Of the original 30 units, three units (MP 1730, 1739, 1744) were repainted to UP yellow and gray, with Missouri Pacific lettering, in November 1984 through August 1985; relettered to UP in January through July 1993.

c.

UPY 715-739 (25 units) are equipped with Automatic Train Stop (ATS) for operation along former C&NW Chicago commuter lines, and Automatic Train Control (ATC) for operation along other former C&NW lines.

d.

Not equipped with dynamic braking.

Note:

1.

UPY 732 (ex UP 1732) and UPY 743 (ex UP 1743) were the first units in this group to be renumbered, both completed on 10 April 2000.

Built as Chicago & Illinois Midland 70-75; purchased by Union Pacific to allow UP to reassign SD40-2s back to road freight service; C&IM units were in lease service nationwide, most recently on SP, which delivered them to UP at Houston in mid-January 1995.

b.

UPY 800-805, as UP 70-75, were initially assigned to freight service at North Little Rock, Arkansas, until all six units were reconditioned and repainted to Union Pacific; during April 1995, the units were formally changed to switch service and assigned to the UP classification yard at North Platte, Nebraska.

Total of 10 C&NW units went to UP at merger, numbered C&NW 6650-6659; all 10 units were originally assigned to C&NW's Proviso Yard in Chicago.

Upon being renumbered/repainted to Union Pacific, UP 2806-2810 were assigned to hump service at UP's hump yard at North Platte, Nebaska; UP 2811 and 2814, and C&NW 6656, 6657, 6659 remained at Proviso; the assignments were the same after all units were renumbered to UPY.

b.

Not equipped with dynamic braking.

c.

UPY 806-815 were purchased on 28 December 2001 upon expiration of their original C&NW lease.

d.

Assigned UP 2806-2815 in June 1995, seven units renumbered; assigned UPY 806-815 in December 1999.

Total of eight units, numbered UPY 816-823; rebuilt from former MP SD40-2s.

b.

Rebuilt by UP at Jenks shops from non-dynamic-brake-equipped former MP SD40-2s; rebuilding program included replacement of original 3000-horsepower 645E3 turbocharged engine with 2000-horsepower 645E blower engine, with rooftop filter box; original SD40-2 radiators and three-radiator-fan configuration retained.

Total of five units, numbered UPY 825-829; rebuilt from Former MP SD40-2s.

b.

Rebuilt by UP at Jenks shops from non-dynamic-brake-equipped former MP SD40-2s; rebuilding program included replacement of original 3000-horsepower 645E3 turbocharged engine with 2000-horsepower 645E blower engine, with rooftop filter box; original SD40-2 radiators and three-radiator-fan configuration retained.

Total of 11 units, numbered UPY 836-846; rebuilt from former MP SD40-2s.

b.

All units are assigned as switch locomotives in all of UP's major yards systemwide.

c.

Rebuilt by UP at Jenks shops from non-dynamic-brake-equipped former MP SD40-2s; the rebuilding program included replacement of original 3000-horsepower 645E3 turbocharged engine with 2000-horsepower 645E blower engine, with rooftop filter box; original SD40-2 radiators and three-radiator-fan configuration were retained.

Total of 20 units, numbered UPY 847-866; rebuilt from former MP SD40-2s and UP SD40-2s.

b.

All units are assigned as switch locomotives in all of UP's major yards systemwide.

c.

Rebuilt by UP at Jenks shops from UP and former MP SD40-2s; the rebuilding program included replacement of original 3000-horsepower 645E3 turbocharged engine with 2000-horsepower 645E blower engine, with rooftop filter box; original SD40-2 radiators and three-radiator-fan configuration were retained.

d.

Former MP units not equipped with dynamic braking.

Notes:

1.

UPY 847 was the first unit in this group to be completed as a UPY unit, completed on 17 December 1999.

2.

UPY 850 was renumbered from UP 4126 on 6 June 2000, then rebuilt to an SD38-2, completed on 22 August 2000.

3.

UPY 855, as UP B4251 was retired on 29 March 2000; reinstated on 1 May 2000; rebuilt to UPY SD38-2 855, completed on 26 May 2000.

4.

The completion date for UPY 867 was changed from 29 November 2005 to 2 December 2005.

These are the first six-axle Genset units to be built; and were built using frames from retired UP SD40-2s.

b.

Railpower's designation is RP20CD; UP uses RP20SD

c.

For unknown reasons, the builder data on the builder plates is in error, as shown in this comment from Jody Moore:

As verified by several independent plate checks, all four of them carry the same serial number of 1RPBDB20875000187 and build date of 12/07. That serial is not correct for any of them. Note that the sixth digit is B, not C. The serial number is also carried in its entirety on RPRX 5407, an RP20BD demonstrator which was produced around the same time. I'm fairly sure that it actually belongs to that unit, and that it isn't correct for any of the four RP20CD's. What's most interesting is that the decals that I've seen photos of actually have the correct unit number printed in the lower right hand corner for the unit that they've been applied to, and appear to have the correct original build dates for the cores used.

d.

UPY 894 and UPY 895 were assembled for Railpower by American Motive Power at Danville, New York

e.

UPY 894 was released in March 2009 and moved to Fort Worth, Texas, for its initial break-in period; moved to Roseville, California for regular service in May 2009, arriving on May 11, 2009.

f.

UPY 895 was released on June 12, 2009 and moved to Houston, Texas, for its initial break-in period

g.

UPY 896, 897, and 898 all have the same builder number. This has been checked and confirmed by three different individuals.

h.

The previous reporting mark for UPY 897, 898, and 899 is WP, a temporary reporting mark used by UP for movement of retired units.

UPY 896 was rebuilt using the former UP 4298 as its core unit; UP 4298 was purchased by Railpower in July 2007 and was stripped of all components by an outside contractor, then shipped to Canada Allied Diesel (CAD), Lachine, Que., for conversion to an RP20SD; UP later furnished UP 3728 (numbered as WP 3729 on March 6, 2008), which was retired on April 2, 2008 and sold to Railpower as credit for Railpower having purchased UP 4298; UPY 896 entered regular service at J. R. Davis Yard in Roseville, California, following a dedication ceremony on May 22, 2008. (Further disposition of UP 3728/WP 3729 unknown.)